CHP Officer Art Montiel said the driver called the CHP later that day, and came to a local CHP office to be interviewed.

The crash happened on southbound Highway 101 near Poplar Avenue at about 12:50 a.m., Montiel said.

The pickup truck apparently crashed into the center divider, causing it to come to a full stop in the left lane, Montiel said. There was then a chain reaction crash that involved four vehicles that were traveling behind the truck.

A 29-year-old passenger in the back seat of a 2010 Mazda suffered major head trauma and was pronounced dead at the scene. The San Mateo County coroner’s office was still trying to notify the victim’s family in Argentina, and had not released his name.

The driver of the Mazda, a 30-year-old man from Palo Alto, was taken to Stanford Hospital with major head injuries.

The occupants of the three other vehicles involved in the crash were not injured.

The CHP is still investigating why the driver of the pickup truck left the scene. No arrests have been made and the driver had not been cited as of Monday morning.

It has not been determined whether drugs or alcohol played a role in the accident, according to the CHP.